Computer-system operation
One more CPUs, device controllers connect through common bus providing access to shared memory Concurrent execution of CPUs and devices competing for memory cycles
Structure => the way in which components relate to each other
Function => the operation of individual components as part of the structure
I/O devices and the CPU can execute concurrently Ehditlliihftildit Each device controller is in charge of a particular device type Each device controller has a local buffer CPUmovesdatafrom/tomainmemoryto/fromlocalbuffers CPU moves data from/to main memory to/from local buffers I/O is from the device to local buffer of controller Device controller informs CPU that it has finished its operation by causing an interrupt